var websocket = null;

//判断当前浏览器是否支持WebSocket
if('WebSocket' in window){
    websocket = new WebSocket("ws://localhost:8888/websocket");
}
else{
    alert('Not support websocket')
}

//连接发生错误的回调方法
websocket.onerror = function(){
    setMessageInnerHTML("error");
};

//连接成功建立的回调方法
websocket.onopen = function(event){
    handWebsocketMsg("open");}

//接收到消息的回调方法
websocket.onmessage = function(event){
    handWebsocketMsg(event.data);
}

//连接关闭的回调方法
websocket.onclose = function(){
    handWebsocketMsg("close");
}

//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
window.onbeforeunload = function(){
    websocket.close();
}

//将消息显示在网页上
function handWebsocketMsg(msg){
    try {
        var msgJson = eval("("+msg+")");
        switch (msgJson.type) {
            case "websocketStatus":
                window.app.$data.message = msg;
                break;
            case "stockTrade":
                window.app.$data.stockTradeArray.push(msgJson.msg);
                break;
        }
    }catch (e) {
        window.app.$data.message = msg;
    }

}

//关闭连接
function closeWebSocket(){
    websocket.close();
}

//发送消息
function send(message){
    websocket.send(message);
}